CN115025616A - Automatic control method for urea method SCR denitration technology of thermal power generating unit - Google Patents
Automatic control method for urea method SCR denitration technology of thermal power generating unit Download PDFInfo
- Publication number
- CN115025616A CN115025616A CN202210669400.6A CN202210669400A CN115025616A CN 115025616 A CN115025616 A CN 115025616A CN 202210669400 A CN202210669400 A CN 202210669400A CN 115025616 A CN115025616 A CN 115025616A
- Authority
- CN
- China
- Prior art keywords
- urea
- nitrogen oxide
- nox
- concentration
- urea flow
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000004202 carbamide Substances 0.000 title claims abstract description 171
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 166
- 238000000034 method Methods 0.000 title claims abstract description 51
- 238000005516 engineering process Methods 0.000 title claims abstract description 35
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 580
- 230000009471 action Effects 0.000 claims abstract description 46
- 239000007921 spray Substances 0.000 claims abstract description 41
- 238000004364 calculation method Methods 0.000 claims abstract description 14
- 239000003245 coal Substances 0.000 claims description 37
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 29
- 239000001301 oxygen Substances 0.000 claims description 29
- 229910052760 oxygen Inorganic materials 0.000 claims description 29
- 230000008859 change Effects 0.000 claims description 22
- 238000000197 pyrolysis Methods 0.000 claims description 15
- 230000001105 regulatory effect Effects 0.000 claims description 14
- 238000006243 chemical reaction Methods 0.000 claims description 13
- 230000003247 decreasing effect Effects 0.000 claims description 12
- 230000007423 decrease Effects 0.000 claims description 11
- 230000033228 biological regulation Effects 0.000 claims description 10
- 230000009699 differential effect Effects 0.000 claims description 9
- 238000012935 Averaging Methods 0.000 claims description 7
- 238000002485 combustion reaction Methods 0.000 claims description 5
- 230000004069 differentiation Effects 0.000 claims description 5
- 230000009467 reduction Effects 0.000 claims description 5
- 230000007704 transition Effects 0.000 claims description 4
- 238000001311 chemical methods and process Methods 0.000 claims description 3
- 230000010354 integration Effects 0.000 claims description 2
- 230000002411 adverse Effects 0.000 claims 1
- ODUCDPQEXGNKDN-UHFFFAOYSA-N Nitrogen oxide(NO) Natural products O=N ODUCDPQEXGNKDN-UHFFFAOYSA-N 0.000 description 41
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 21
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 7
- 229910021529 ammonia Inorganic materials 0.000 description 7
- 239000003546 flue gas Substances 0.000 description 7
- 239000003638 chemical reducing agent Substances 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 4
- 230000035484 reaction time Effects 0.000 description 4
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 3
- 235000011114 ammonium hydroxide Nutrition 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000003915 air pollution Methods 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 206010022000 influenza Diseases 0.000 description 1
- 238000010327 methods by industry Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 231100000989 no adverse effect Toxicity 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/346—Controlling the process
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2067—Urea
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses an automatic control method for a urea method SCR denitration technology of a thermal power generating unit, which comprises the steps of proportional-integral-derivative control PID cascade control, wherein the first-stage PID control is used for adjusting the deviation between the average concentration value of nitrogen oxide NOx at an outlet and a set value of the average concentration value, and the output of the first-stage PID control is part of a second-stage PID urea flow instruction; secondly, performing predictive control, wherein the output of the predictive control is the other part of the second-stage PID urea flow instruction, and the two parts are added to form a urea flow instruction; the second stage PID control is used for adjusting the deviation between the urea flow instruction and the actual urea flow; in addition, the Smith prediction circuit calculates the action command of the urea spray gun, and the action command and the output command of the first part of PID series are subjected to subtraction calculation to obtain the final action command of the urea spray gun; the opening of the urea spray gun is controlled by the action command of the urea spray gun, and finally, the automatic control of the whole urea method SCR denitration technology is realized. The invention realizes the advanced adjustment of the urea flow spray gun and avoids the disturbance caused by large inertia.
Description
Technical Field
The invention relates to the technical field of automatic control of thermal power stations, in particular to an automatic control method for a urea method SCR denitration technology of a thermal power unit.
Background
The energy consumption of China is mainly coal, most of the emission of carbon dioxide, nitrogen oxides, smoke dust and the like in air pollution emission comes from the combustion of coal, the smoke emission pollution of a coal-fired boiler of a thermal power generating unit is most prominent, and the emitted pollutants cause great harm to the ecological environment and have great influence on the health of human bodies. With the rapid development of economy, governments are becoming more aware of the necessity and urgency of environmental protection, and Nitrogen Oxides (NO) X ) As a large source of air pollution, mainly NO and NO 2 The main environmental pollutants, such as acid rain, greenhouse effect, ozone depletion, photochemical smog and the like, caused by the environmental pollutants directly or indirectly are all the key problems for ecological environment treatment.
Over 90% of Nitrogen Oxides (NO) in smoke emission of thermal power generating unit X ) Exists in the form of NO, and the SCR denitration technology adopts chemical reaction to reduce pollutants in the part of flue gas into harmless nitrogen (N) 2 ) And water (H) 2 0) Nitrogen Oxide (NO) X ) The discharge amount of the oil is reduced to be within the national standard, which relieves the pressure of the environment to a certain extent. The main advantage of this denitration technique is Nitrogen Oxide (NO) X ) The conversion rate is high, and the reaction product is safe and harmless, and is widely applied to various thermal power generating units at present.
The reducing agent used in the SCR denitration technique is typically:
1) liquid ammonia
Liquid ammonia is a colorless gas at normal temperature and has an irritating odor. Unstable chemical property, toxicity, easy combustion, and easy combustion and explosion. When ammonia gas leaks, the health of human body can be seriously damaged.
2) Aqueous ammonia
The ammonia water is about 20-30% aqueous solution, and is relatively safe, and the transportation cost is high due to large transportation volume. Ammonia water is weakly alkaline and strongly anticorrosive, is harmful to human bodies, and can explode particularly when reaching a certain concentration in air.
3) Urea
Urea is used as a novel environment-friendly reducing agent and is white solid particles or crystals at normal temperature, and pyrolysis of urea is often adopted to prepare ammonia vapor in industrial application. The greatest advantage of urea over liquid ammonia and ammonia is its safety.
No matter which reagent is adopted as a reducing agent, the essence of the SCR denitration technology is a chemical reaction with a certain reaction process, and the process needs a certain reaction time to complete the reaction of Nitrogen Oxide (NO) X ) The controlled system is called a large-delay and large-inertia control system from the viewpoint of automatic control, and is characterized by large control difficulty and poor control precision. Compared with liquid ammonia denitration technology, the urea denitration technology adds the process engineering of pyrolyzing urea into ammonia vapor, and further prolongs the reduction of Nitrogen Oxides (NO) X ) The reaction time of (2) will be more difficult to control for automatic control.
At present, most of newly-built thermal power generating units adopt a urea method denitration technology, and a great part of old thermal power generating units change the liquid ammonia method denitration technology used by the old thermal power generating units into the urea method denitration technology due to safety consideration. In the future, urea as a reducing agent will occupy a larger proportion in the SCR denitration technology of the thermal power generating unit, and the automatic control of the thermal power generating unit will become more and more important.
Disclosure of Invention
In order to solve the characteristics of large delay and large inertia existing in the urea method SCR denitration technology, the invention aims to provide an automatic control method for the urea method SCR denitration technology of the thermal power generating unit, which adopts a more reasonable control strategy to ensure the outlet Nitrogen Oxide (NO) of a controlled object unit of the urea method SCR denitration technology X ) Stable and meets the economic and safe operation indexes of the unit.
In order to achieve the above purpose, the invention is implemented by the following technical scheme:
an automatic control method for a urea method SCR denitration technology of a thermal power generating unit comprises the following steps:
the method comprises the following steps: PID cascade control is controlled by proportional-integral-derivative control, wherein the first stage PID control corrects and adjusts the deviation between the average value of the concentration of the NOx in the outlet nitrogen oxide and the set value of the concentration of the NOx in the outlet nitrogen oxide, and the output of the first stage PID control is used as a part of a second stage PID urea flow instruction; secondly, forecasting the change trend of the concentration of outlet Nitrogen Oxide (NOX) according to the change trends of the coal quantity, the air quantity and the oxygen quantity inside the boiler, obtaining a urea flow instruction required by the calculation of the forecasting control loop, calculating a path of required urea flow instruction according to the change trend of the average value of the concentration of the inlet Nitrogen Oxide (NOX) of the denitration device, adding the urea flow instructions to obtain a final required urea flow instruction, and correcting and adjusting the actual urea flow through a second-stage PID (proportion integration differentiation) to obtain an action instruction of the urea spray gun;
step two: the Smith predictive control loop calculates an action command of a urea spray gun, and the action command and the output command of the first part of PID series are subjected to subtraction calculation to obtain a final action command of the urea spray gun;
step three: and the opening of the urea flow regulating spray gun 4 is controlled by an opening instruction 18 of the urea flow regulating spray gun, and finally, the whole urea SCR denitration technology is automatically controlled.
Compared with the prior art, the invention has the following advantages:
aiming at the characteristics of large delay and large inertia of the urea method SCR denitration technology, an optimal prediction point is found as far as possible to judge the variation trend of the concentration of Nitrogen Oxides (NOX) in advance.
The influence of oxygen quantity on the concentration of Nitrogen Oxide (NOX) is creatively divided into quick coarse adjustment and accurate fine adjustment, the variation of the air-coal ratio is introduced, the variation trend of the concentration of the Nitrogen Oxide (NOX) is quickly predicted in advance, on the basis, the oxygen quantity of a boiler is introduced, the variation trend of the concentration of the Nitrogen Oxide (NOX) is finally and accurately determined, the concentration of the Nitrogen Oxide (NOX) is controlled from a process perspective, and the problem is fundamentally solved.
By adopting a cascade control strategy, on the basis of considering the deviation between the concentration of the Nitrogen Oxide (NOX) and the concentration set value, whether the urea flow reaches the flow set value requirement is also considered, all loops are ensured to meet the requirement, and finally, the accurate control of the concentration of the Nitrogen Oxide (NOX) is realized.
A chemical reaction process is combined with a urea method SCR denitration technology, a model similar to the urea method SCR denitration technology is built, a Smith pre-estimation control algorithm is adopted, the advance callback of the urea flow adjusting spray gun is achieved, and disturbance caused by large inertia is avoided.
The concentration of Nitrogen Oxide (NOX) under the control of the strategy can realize the automatic whole-course investment of the urea flow regulation spray gun, adapt to various lifting load working conditions of a unit, greatly reduce the operation burden of operators and provide further guarantee for the intelligent operation of a power plant.
Drawings
FIG. 1 is a schematic diagram of a control system according to the present invention.
Description of the reference numerals:
1-high-temperature hot air from a primary hot air outlet; 2-urea pyrolysis furnace;
3-urea solution from a urea pump; 4-urea flow regulation spray gun;
5-urea flow signal measuring point; 6-raw flue gas from coal economizer;
7-A, B two-side reactor; 8, conveying the flue gas to a flue of an air preheater;
9-A, B two-side inlet Nitrogen Oxides (NO) X ) A concentration signal measuring point;
10-A, B two-side outlet Nitrogen Oxide (NO) X ) A concentration signal measuring point;
11-outlet Nitrogen Oxides (NO) X ) A concentration set value;
12-outlet Nitrogen Oxides (NO) X ) Average concentration value;
13-Inlet Nitrogen Oxide (NO) X ) The average value of the concentration;
14-total air volume; 15-total coal amount; 16-boiler oxygen amount;
17-Total Urea flow into the pyrolysis furnace;
18-urea flow regulating spray gun opening degree instruction;
19-first PID controller; 20-first subtraction operator;
21-first differential operator; 22-first function generator;
23-second differential operator; 24-first addition operator;
25-division operator; 26-third differential operator;
27-fourth differential operator; 28-second addition operator;
29-third addition operator; 30-second PID controller;
31-second subtractor; 32-pure hysteresis operator;
33-inertial operator;
Detailed Description
An automatic control system for a urea method SCR denitration technology of a thermal power generating unit comprises high-temperature hot air 1 from a primary hot air outlet, urea solution 3 from a urea pump, the urea solution 3 from the urea pump is distributed by 4 horizontally-arranged urea flow adjusting spray guns 4, needed urea is fed into a urea pyrolysis furnace 2, the urea is pyrolyzed into ammonia vapor by the high-temperature hot air 1 from the primary hot air outlet in the urea pyrolysis furnace 2, the ammonia vapor from the urea pyrolysis furnace 2 enters A, B reactors 7 on two sides respectively in two ways, raw flue gas 6 from a coal economizer enters A, B reactors 7 respectively through flues on two sides in a boiler, in the reactors 7 at the two sides of A, B, ammonia vapor is mixed with NO in the original flue gas, reduction denitration reaction is carried out under the action of a catalyst, and finally the flue gas which meets the national standard after denitration is sent to the flue of the air preheater through the flue gas to the flue 8 of the air preheater; the urea flow control device comprises 4 urea flow control spray guns 4 which are horizontally arranged to control the urea demand of the whole reaction process, and a first PID controller 19, a second addition arithmetic unit 28, a second PID controller 30 and a second subtraction arithmetic unit 31 which are connected with the urea flow control spray guns 4, wherein the opening degree instruction 18 of the urea flow control spray guns is obtained through calculation so as to control the opening degree of the urea flow control spray guns 4; a corresponding urea flow signal measuring point 5 is respectively arranged at the outlet of each urea flow regulating spray gun 4, and a Nitrogen Oxide (NO) inlet A, B at the two sides is respectively arranged at the inlets of the A, B two-side reactors X ) A concentration signal measuring point 9 is arranged at the outlet of the reactor at the two sides of A, B, and nitrogen oxides (N) at the two sides of A, B are respectively arranged at the outlet of the reactor at the two sides of A, BO X ) A concentration signal measuring point 10.
The first PID controller 19 and the second PID controller 30 act together as a cascade control loop, the first PID controller 19 is used as a main regulation controller, and the input signal of the first PID controller comprises two paths, wherein the first path is an outlet Nitrogen Oxide (NO) X ) A concentration set value 11, which is realized in a manner that an operator directly sets according to the requirement; the second path is the outlet Nitrogen Oxide (NO) which needs to be controlled and regulated X ) Concentration average 12, Nitrogen Oxide (NO) from both side outlets of A, B X ) The concentration signal measuring points 10 are calculated after being averaged; the first PID controller 19 includes proportional P, integral I action, the output of which is part of the urea flow command, and the first PID controller 19 outputs Nitrogen Oxides (NO) to the outlet X ) The deviation of the concentration is adjusted in a small range, and the adjustment in a large range is completed by a prediction control loop; the predictive control loop includes four paths, the first path being outlet Nitrogen Oxide (NO) X ) The concentration deviation value prediction circuit has the control idea that: outlet Nitrogen Oxides (NO) X ) Average concentration 12 and outlet Nitrogen Oxides (NO) X ) The concentration set value 11 is calculated by a first subtraction operator 20 to obtain the outlet Nitrogen Oxide (NO) X ) The concentration deviation value is calculated by a first differential operator 21 to obtain the outlet Nitrogen Oxide (NO) X ) Urea flow instructions corresponding to the variation of the concentration deviation value; the second way is the inlet Nitrogen Oxide (NO) X ) A concentration prediction loop, which can be understood as a proportional Plus Derivative (PD) link, the control concept is: inlet Nitrogen Oxides (NO) X ) Concentration average 13 from inlet Nitrogen Oxides (NO) on both sides of A, B X ) The concentration signal measuring point 9 is obtained by calculation after averaging, and the inlet Nitrogen Oxide (NO) after the averaging treatment is carried out X ) The concentration average 13 is calculated by a first function generator 22 to obtain the inlet Nitrogen Oxide (NO) X ) The urea flow command corresponding to the concentration average can be understood as a proportional element, which is further used to control the inlet Nitrogen Oxides (NO) X ) The concentration average value 13 is calculated by a second differential operator 23 to obtain the inlet Nitrogen Oxide (NO) X ) The differential of the concentration average corresponds to the urea flow command, which is a differential element, the output of the first function generator 22 andthe output values of the second differential operator 23 are added by the first adder 24 to obtain an inlet Nitrogen Oxide (NO) X ) The urea flow instruction corresponding to the concentration average value finally; the third path is a wind-coal ratio prediction control loop, and the control idea is as follows: introducing a total air volume 14 signal and a total coal volume 15 signal, calculating by a division arithmetic unit 25 to obtain an instantaneous air-coal ratio value, and calculating by a third differential arithmetic unit 26 to obtain a urea flow instruction corresponding to the variation of the total air volume 14 and the total coal volume 15; the fourth way is a boiler oxygen amount prediction control loop, and the control idea is as follows: introducing a boiler oxygen amount 16 signal, and calculating by a fourth differential operator 27 to obtain a urea flow instruction corresponding to the variation of the boiler oxygen amount 16; the four prediction control loops are added through a second addition arithmetic unit 28 to obtain a urea flow prediction control loop instruction, and the urea flow instruction output by the first PID controller 19 and the urea flow prediction control loop instruction are added through a third addition arithmetic unit 29 to obtain a final urea flow instruction; the second PID controller 30 is used as an auxiliary controller, and its input signal includes two paths, the first path is the urea flow instruction calculated by the third addition operator 29; the second path is the total urea flow 17 entering the pyrolysis furnace, and the total urea flow 17 entering the pyrolysis furnace is obtained by adding urea flow signal measuring points 5 arranged at the outlets of the 4 urea flow adjusting spray guns; the second PID controller 30 includes proportional P and integral I functions, and its output is a urea flow regulating lance opening command.
The input signal of the second subtraction operator 31 includes two paths, the first path is the output of the second PID controller 30 calculated by the cascade control loop; the second path is a smith pre-estimation algorithm control loop, the opening degree instruction 18 of the urea flow regulating spray gun is calculated through the delay compensation of a pure delay arithmetic unit 32 and an inertia arithmetic unit 33 to obtain the opening degree compensation value of the urea flow regulating spray gun needing to be compensated, and the two paths of signals are calculated through the difference value of a second subtraction arithmetic unit 31 to obtain the opening degree instruction 18 of the urea flow regulating spray gun which is finally controlled and output.
A control method of an automatic control system of a urea method SCR denitration technology of a thermal power generating unit comprises two parts, wherein one part is PID cascade controlTo outlet Nitrogen Oxides (NO) X ) Concentration mean and outlet Nitrogen Oxides (NO) X ) Correcting and adjusting the deviation between the concentration set values, and extracting main outlet Nitrogen Oxides (NO) according to the reaction characteristics of the interior of the boiler of the thermal power generating unit and denitration equipment X ) Influence parameters are generated by concentration change, predictive control is carried out in advance, the difficulty that the control inertia of the urea method denitration technology is large is overcome, the other part is controlled by a Smith prediction algorithm, the chemical process time of the urea reduction denitration reaction is simulated by establishing a model, and a control system carries out callback in advance, so that delay disturbance caused by large inertia is avoided; wherein, the urea flow regulation spray gun 4 regulates the outlet Nitrogen Oxide (NO) by controlling the urea amount entering the urea pyrolysis furnace 2 in a cascade control mode X ) The concentration cascade control mode is mainly adjusted to a first PID controller 19, secondarily adjusted to a second PID controller 30, and used for controlling the Nitrogen Oxides (NO) at the outlets of A, B two sides X ) Calculating to obtain outlet Nitrogen Oxide (NO) after averaging concentration signal measuring points 10 X ) The concentration average value 12 is the controlled object of the first PID controller 19, and the set value is the outlet Nitrogen Oxide (NO) X ) The concentration setpoint 11, which is implemented by the operator directly on demand, is set by the first PID controller 19, whose regulation includes a proportional P action, an integral I action, when Nitrogen Oxides (NO) are present at the outlet X ) Outlet Nitrogen Oxides (NO) when the concentration mean value 12 increases X ) Average concentration 12 and outlet Nitrogen Oxides (NO) X ) When a positive deviation occurs between the concentration set values 11, the proportional P action and the integral I action of the first PID controller 19 start to act, and an action instruction for increasing the output of the first PID controller 19 is sent; also, when Nitrogen Oxides (NO) are discharged X ) Outlet Nitrogen Oxide (NO) when the concentration average 12 is decreased X ) Average concentration 12 and outlet Nitrogen Oxides (NO) X ) A negative deviation occurs between the concentration set values 11, so that the proportional P action and the integral I action of the first PID controller 19 start to act, and an action instruction for reducing the output of the first PID controller 19 is sent; four paths of prediction control loops are designed; the first path of predictive control loop: the differential control law has the advanced characteristic, and for the denitration control of the controlled object with large delay and large inertia, the differential control can effectively relieve the denitration controlHysteresis characteristics, outlet Nitrogen Oxides (NO) X ) Average concentration 12 and outlet Nitrogen Oxides (NO) X ) The concentration set value 11 is calculated by a first subtraction operator 20 to obtain the outlet Nitrogen Oxide (NO) X ) The concentration deviation value is calculated by a first differential operator 21 to obtain the outlet Nitrogen Oxide (NO) X ) Urea flow command corresponding to variation of concentration deviation value, when Nitrogen Oxide (NO) is discharged X ) Outlet Nitrogen Oxides (NO) when the concentration mean 12 increases X ) The concentration deviation value also rises, the differential action of the first differential operator 21 starts to act, and an action command for increasing the output of the first differential operator 21 is sent; also, when Nitrogen Oxides (NO) are discharged X ) Outlet Nitrogen Oxides (NO) when the concentration average 12 decreases X ) The concentration deviation value is also reduced, the differential action of the first differential operator 21 starts to act, and an action command for reducing the output of the first differential operator 21 is sent; the second predictive control loop: inlet Nitrogen Oxides (NO) X ) A concentration predicting loop, for a denitration system, under the premise of constant ammonia steam flow, inlet Nitrogen Oxide (NO) X ) Trend of concentration and outlet Nitrogen Oxides (NO) X ) The concentration variation trends are completely consistent, the inlet concentration rises, the outlet concentration also rises after a certain reaction time, and similarly, the inlet concentration decreases, and the outlet concentration also decreases after a certain reaction time, so that the inlet Nitrogen Oxide (NO) is selected X ) The change of concentration is intervened in advance to make the urea flow reach the required value in advance so as to ensure that the Nitrogen Oxide (NO) is discharged X ) The concentration is maintained near the set value; the specific implementation mode is that the inlet Nitrogen Oxide (NO) X ) Mean concentration of 13, Nitrogen Oxides (NO) from both sides of A, B X ) The concentration signal measuring point 9 is obtained by calculation after averaging, and the inlet Nitrogen Oxide (NO) after the averaging treatment is carried out X ) The concentration average 13 is calculated by a first function generator 22 to obtain the inlet Nitrogen Oxide (NO) X ) The specific setting parameters of the first function generator 22 for the urea flow command corresponding to the average concentration value are as shown in table 1:
table 1: inlet Nitrogen Oxides (NO) X ) Concentration average value corresponding urea flow instruction function table
The first function generator 22 is set to the point that it can be based on the inlet Nitrogen Oxides (NO) X ) Variation of the concentration mean 13 provides the required urea flow command in real time, maintaining the outlet Nitrogen Oxides (NO) in advance X ) The concentration average value is 12; the Nitrogen Oxide (NO) is introduced into the inlet X ) The concentration average value 13 is calculated by a second differential operator 23 to obtain the inlet Nitrogen Oxide (NO) X ) Urea flow command corresponding to the derivative of the concentration average when Nitrogen Oxides (NO) are introduced X ) When the density average value 13 rises, the differential action of the second differential operator 23 starts to operate, and an operation command for increasing the output of the second differential operator 23 is issued; also, when Nitrogen Oxides (NO) are introduced X ) When the density average value 13 decreases, the differentiating action of the second differential operator 23 starts to operate, and an operation command for decreasing the output of the second differential operator 23 is issued; the output value of the first function generator 22 and the output value of the second differential operator 23 are added by a first adder 24 to obtain an inlet Nitrogen Oxide (NO) X ) The urea flow instruction corresponding to the concentration average value finally; a third predictive control loop: wind coal ratio predictive control loop, Nitrogen Oxide (NO) X ) The main factors of generation of (1) are high temperature and oxygen enrichment, and considering the condition that the temperature does not change much, the oxygen enrichment is to generate Nitrogen Oxide (NO) X ) The oxygen amount depends on the relative proportion of the air quantity and the coal quantity, and the change of the air quantity and the coal quantity can directly influence the Nitrogen Oxide (NO) X ) So that the total air quantity 14 signal and the total coal quantity 15 signal entering the boiler furnace are selected to realize the control of Nitrogen Oxide (NO) X ) The earliest preliminary judgment of the change is that the instantaneous wind-coal ratio value is calculated by a division arithmetic unit 25 according to a total air volume 14 signal and a total coal volume 15 signal, the urea flow instruction corresponding to the variation of the wind-coal ratio is obtained by a third differential arithmetic unit 26, and when the instantaneous wind-coal ratio value calculated by the division arithmetic unit 25 rises, the variation of the air volume is instantaneously larger than the coal volumeThe differential action of the third differential operator 26 starts to operate, and an operation command for increasing the output of the third differential operator 26 is issued; similarly, when the divider 25 calculates that the instantaneous value of the air-coal ratio is decreased, indicating that the variation of the air volume is instantaneously smaller than that of the coal volume, the differentiation of the third differential operator 26 starts to operate, and an operation command for decreasing the output of the third differential operator 26 is issued; the fourth prediction control loop: the wind-coal ratio prediction control mainly realizes rapidity, and belongs to oxygen content to Nitrogen Oxide (NO) X ) Based on the coarse adjustment, the boiler oxygen quantity signal is introduced to accurately represent the Nitrogen Oxide (NO) by considering the complexity of the internal combustion of the boiler X ) The accuracy of the regulation, is oxygen to Nitrogen Oxide (NO) X ) A coarse adjustment of (2); introducing a boiler oxygen amount 16 signal, obtaining a urea flow instruction corresponding to the variation of the boiler oxygen amount 16 through calculation of a fourth differential operator 27, and when the boiler oxygen amount 16 is increased, starting the differential action of the fourth differential operator 27 to send an action instruction for increasing the output of the fourth differential operator 27; similarly, when the boiler oxygen amount 16 is decreased, the differentiation action of the fourth differential operator 27 starts to operate, and an operation command for decreasing the output of the fourth differential operator 27 is issued; the four prediction control loops are calculated by a second adder 28 to obtain a urea flow prediction control loop instruction, and the urea flow instruction output by the first PID controller 19 and the urea flow prediction control loop instruction are calculated by a third adder 29 to obtain a final urea flow instruction; the second PID controller 30 is used as an auxiliary controller, and its input signal includes two paths, the first path is the urea flow instruction calculated by the third addition operator 29; the second path is the total urea flow 17 entering the pyrolysis furnace, the second PID controller 30 comprises the proportional P and integral I functions, the output of the second PID controller is a urea flow adjusting spray gun opening instruction, when the urea flow instruction calculated by the third addition operator 29 is increased, the urea flow instruction calculated by the third addition operator 29 and the total urea flow 17 entering the pyrolysis furnace generate positive deviation, the proportional P and integral I functions of the second PID controller 30 start to act, and an action instruction for increasing the output of the second PID controller 30 is sent(ii) a Similarly, when the urea flow command calculated by the third adder 29 decreases, a negative deviation occurs between the urea flow command calculated by the third adder 29 and the total urea flow 17 entering the pyrolysis furnace, so that the proportional P action and the integral I action of the second PID controller 30 start to act, and an action command for reducing the output of the second PID controller 30 is sent; the other part is Smith prediction control, the strategy is specially used for a controlled object with large delay and large inertia such as urea method denitration technology, wherein the pure lag operator 32 simulates a pure lag link in the algorithm, the inertia operator 33 simulates a capacity lag link in the algorithm, a loop compensated by the smith estimation algorithm is controlled, no adverse effect is generated on the system, only the output signal of the original second PID controller 30 is time-shifted, the pure lag operator 32 has the working principle of delaying and outputting an input signal, the delay time is the delay time set in the pure lag operator 32, the inertia operator 33 has the working principle of leading the input signal to pass through a certain transition time to lead the output value to be equal to the input value, and the transition time is the inertia time set in the inertia operator 33, simulating the chemical process time of the urea reduction denitration reaction by a pure lag arithmetic unit 32 and an inertia arithmetic unit 33; when the opening instruction 18 of the urea flow regulating spray gun changes at a moment, the opening compensation value of the urea flow regulating spray gun needing to be compensated is obtained through the delay compensation calculation of the pure delay arithmetic unit 32 and the inertia arithmetic unit 33, then the opening compensation value and the output value of the second PID controller 30 are calculated through the second subtraction arithmetic unit 31, the real-time opening instruction 18 of the urea flow regulating spray gun is obtained, and compared with a control loop without a Smith prediction algorithm, the system can be adjusted back in advance, and the disturbance caused by large inertia is avoided.
Claims (9)
1. An automatic control method for a urea method SCR denitration technology of a thermal power generating unit is characterized by comprising the following steps:
the method comprises the following steps: PID cascade control is carried out by proportional integral derivative control, wherein the first stage PID control is used for correcting and adjusting the deviation between the average value of the concentration of the NOx in the outlet nitrogen oxide and the set value of the concentration of the NOx in the outlet nitrogen oxide, and the output of the first stage PID control is used as a part of a second stage PID urea flow instruction; secondly, forecasting the change trend of the concentration of outlet Nitrogen Oxide (NOX) according to the change trends of the coal quantity, the air quantity and the oxygen quantity inside the boiler, obtaining a urea flow instruction required by the calculation of the forecasting control loop, calculating a path of required urea flow instruction according to the change trend of the average value of the concentration of the inlet Nitrogen Oxide (NOX) of the denitration device, adding the urea flow instructions to obtain a final required urea flow instruction, and correcting and adjusting the actual urea flow through a second-stage PID (proportion integration differentiation) to obtain an action instruction of the urea spray gun;
step two: the Smith predictive control loop calculates an action command of a urea spray gun, and the action command and the output command of the first part of PID series are subjected to subtraction calculation to obtain a final action command of the urea spray gun;
step three: the opening of the urea flow adjusting spray gun 4 is controlled by the opening instruction 18 of the urea flow adjusting spray gun, and finally, the whole urea SCR denitration technology is automatically controlled.
2. The automatic control method for the urea-process SCR denitration technology of the thermal power generating unit according to claim 1, characterized in that,
the method comprises the following steps: PID cascade control refers to proportional-integral-derivative control, wherein deviation between an average outlet Nitrogen Oxide (NOX) concentration value and a set outlet Nitrogen Oxide (NOX) concentration value is corrected and adjusted through a proportional-integral function of PID, and according to reaction characteristics of the interior of a boiler of a thermal power unit and denitration equipment, parameters mainly influencing outlet Nitrogen Oxide (NOX) concentration change are extracted, and prediction control is performed in advance; the predictive control loop includes four paths: the first path of prediction control loop: a differential control loop for the deviation between the average outlet nitrogen oxide (NOx) concentration and a set outlet nitrogen oxide (NOx) concentration value; the second predictive control loop: an inlet nitrogen oxide (NOx) concentration prediction loop; a third predictive control loop: a wind coal ratio prediction control loop; the fourth prediction control loop: the oxygen amount prediction control loop in the boiler, the four prediction control loops are calculated by a second addition arithmetic unit 28 to obtain the urea flow prediction control loop instruction; the urea flow instruction output by the first PID controller 19 and the urea flow prediction control loop instruction are calculated by a third addition arithmetic unit 29 to obtain a final urea flow instruction; the second PID controller 30 is used as an auxiliary controller, and its input signal includes two paths, the first path is the urea flow instruction calculated by the third addition operator 29; the second path is the total urea flow 17 entering the pyrolysis furnace, the second PID controller 30 comprises the proportional P and integral I functions, the output of the second PID controller is a urea flow adjusting spray gun opening instruction, when the urea flow instruction calculated by the third addition operator 29 is increased, a positive deviation occurs between the urea flow instruction calculated by the third addition operator 29 and the total urea flow 17 entering the pyrolysis furnace, the proportional P function and the integral I function of the second PID controller 30 start to act, and an action instruction for increasing the output of the second PID controller 30 is sent; similarly, when the urea flow command calculated by the third adder 29 decreases, a negative deviation occurs between the urea flow command calculated by the third adder 29 and the total urea flow 17 entering the pyrolysis furnace, so that the proportional P action and the integral I action of the second PID controller 30 start to act, an action command for reducing the output of the second PID controller 30 is sent, and finally, an opening command of the urea flow regulation spray gun of the PID cascade prediction control loop is obtained.
3. The automatic control method for the thermal power generating unit urea method SCR denitration technology according to claim 2, characterized in that the PID cascade control is mainly implemented by a first PID controller 19 and a second PID controller 30, the average value of the concentration 12 of the outlet nitrogen oxide (NOx) obtained by averaging the signal measuring points 10 of the concentration of the outlet nitrogen oxide (NOx) at both sides A, B is the controlled object of the first PID controller 19, the set value is the set value 11 of the concentration of the outlet nitrogen oxide (NOx), the set value is implemented by directly setting by an operator according to the requirement, the adjustment of the first PID controller 19 comprises a proportional P function and an integral I function, when the average value 12 of the concentration of the outlet nitrogen oxide (NOx) rises, a positive deviation occurs between the average value 12 of the concentration of the outlet nitrogen oxide (NOx) and the set value 11 of the concentration of the outlet nitrogen oxide (NOx), starting the proportional P action and integral I action of the first PID controller 19, and sending an action command for increasing the output of the first PID controller 19; similarly, when the average outlet Nitrogen Oxide (NOX) concentration 12 decreases, a negative deviation occurs between the average outlet Nitrogen Oxide (NOX) concentration 12 and the set outlet Nitrogen Oxide (NOX) concentration 11, the proportional P action and the integral I action of the first PID controller 19 start to operate, and an operation command for decreasing the output of the first PID controller 19 is issued.
4. The automatic control method for the thermal power generating unit urea method SCR denitration technology according to claim 2, characterized in that a first prediction control loop: the differential control law has a lead characteristic, the characteristic that the differential control can effectively relieve the lag is adopted, the outlet Nitrogen Oxide (NOX) concentration average value 12 and the outlet Nitrogen Oxide (NOX) concentration set value 11 are calculated by a first subtraction operator 20 to obtain an outlet Nitrogen Oxide (NOX) concentration deviation value, then a urea flow instruction corresponding to the variation of the outlet Nitrogen Oxide (NOX) concentration deviation value is obtained by calculation of a first differential operator 21, when the outlet Nitrogen Oxide (NOX) concentration average value 12 is increased, the outlet Nitrogen Oxide (NOX) concentration deviation value is also increased, the differential action of the first differential operator 21 starts to act, and an action instruction for increasing the output of the first differential operator 21 is sent; similarly, when the average outlet Nitrogen Oxide (NOX) concentration 12 decreases, the outlet Nitrogen Oxide (NOX) concentration deviation value also decreases, the differentiating action of the first differential operator 21 starts to operate, and an operation command for decreasing the output of the first differential operator 21 is issued.
5. The automatic control method for the urea-process SCR denitration technology of the thermal power generating unit as claimed in claim 2, wherein the second predictive control loop comprises: an inlet Nitrogen Oxide (NOX) concentration prediction loop selects the change of the inlet nitrogen oxide NOX concentration and intervenes in advance to make the urea flow reach a required value in advance so as to ensure that the outlet nitrogen oxide NOX concentration is maintained near a set value; the specific implementation mode is as follows: the inlet nitrogen oxide NOx concentration average value 13 is obtained by averaging inlet nitrogen oxide NOx concentration signal measuring points 9 on two sides of A, B, the averaged inlet nitrogen oxide NOx concentration average value 13 is calculated through a first function generator 22, and a urea flow instruction corresponding to the inlet nitrogen oxide NOx concentration average value is obtained, wherein the first function generator 22 is set to provide a required urea flow instruction in real time according to the change of the inlet nitrogen oxide NOx concentration average value 13, and the stability of the outlet nitrogen oxide NOx concentration average value 12 is maintained in advance; the inlet nitrogen oxide NOx concentration average value 13 is calculated by a second differential operator 23 to obtain a urea flow instruction corresponding to the differential of the inlet nitrogen oxide NOx concentration average value, and when the inlet nitrogen oxide NOx concentration average value 13 rises, the differential action of the second differential operator 23 starts to act to send an action instruction for increasing the output of the second differential operator 23; similarly, when the inlet nitrogen oxide NOX concentration average value 13 decreases, the differentiating action of the second differential operator 23 starts to operate, and an operation command for decreasing the output of the second differential operator 23 is issued; the output value of the first function generator 22 and the output value of the second differential operator 23 are added by the first adder 24 to obtain a urea flow rate command corresponding to the average value of the concentration of the inlet Nitrogen Oxides (NOX).
6. The automatic control method for the thermal power generating unit urea method SCR denitration technology according to claim 2, characterized in that a third predictive control loop: the air-coal ratio prediction control loop is characterized in that the main generation factors of nitrogen oxide NOX are high temperature and oxygen enrichment, and under the condition of considering that the temperature change is not large, the oxygen enrichment is the most main generation factor of the nitrogen oxide NOX, the amount of oxygen depends on the relative proportion of air quantity and coal quantity, and the change of the air quantity and the coal quantity can directly influence the change of the nitrogen oxide NOX, so that a total air quantity 14 signal and a total coal quantity 15 signal entering a boiler furnace are selected, a primary judgment of the earliest change of the nitrogen oxide NOX can be realized, the total air quantity 14 signal and the total coal quantity 15 signal are calculated by a division arithmetic unit 25 to obtain an instantaneous air-coal ratio value, a urea flow instruction corresponding to the variation of the air-coal ratio is obtained by calculation of a third differential arithmetic unit 26, when the instantaneous air-coal ratio value calculated by the division arithmetic unit 25 is increased, the variation of the air quantity is instantaneously larger than the variation of the coal quantity, the differential action of the third differential operator 26 starts to operate, and an operation command for increasing the output of the third differential operator 26 is issued; similarly, when the divider 25 calculates that the instantaneous wind/coal ratio value is decreased, it indicates that the amount of change in the air flow is instantaneously smaller than the amount of change in the coal flow, and the differentiation operation of the third differential operator 26 starts, and an operation command for decreasing the output of the third differential operator 26 is issued.
7. The automatic control method for the urea method SCR denitration technology of the thermal power generating unit according to claim 2, characterized in that a fourth prediction control loop: the wind-coal ratio prediction control mainly realizes rapidity, belongs to coarse adjustment of oxygen content to nitrogen oxide NOX, introduces an oxygen content signal of a boiler in consideration of complexity of combustion inside the boiler, accurately represents change of the nitrogen oxide NOX, realizes adjustment accuracy, and belongs to coarse adjustment of the oxygen content to the nitrogen oxide NOX; introducing a boiler oxygen amount 16 signal, obtaining a urea flow instruction corresponding to the variation of the boiler oxygen amount 16 through calculation of a fourth differential operator 27, and when the boiler oxygen amount 16 is increased, starting the differential action of the fourth differential operator 27 to send an action instruction for increasing the output of the fourth differential operator 27; similarly, when the boiler oxygen amount 16 decreases, the differentiating action of the fourth differential operator 27 starts to operate, and an operation command for decreasing the output of the fourth differential operator 27 is issued.
8. The automatic control method for the urea-process SCR denitration technology of the thermal power generating unit according to claim 1, it is characterized in that in the second step, the smith estimation control is performed, wherein the pure lag operator 32 simulates a pure lag link in the algorithm, the inertia operator 33 simulates a capacity lag link in the algorithm, a loop compensated by the smith estimation control is not adversely affected, only the time shift is performed on the output signal of the original second PID controller 30, the pure lag operator 32 operates by delaying the input signal for output, the delay time is the delay time set in the pure lag operator 32, the inertia operator 33 operates by passing the input signal for a certain transition time, so that the output value is equal to the input value, and the transition time is the inertia time set in the inertia operator 33, simulating the chemical process time of the urea reduction denitration reaction by a pure lag arithmetic unit 32 and an inertia arithmetic unit 33; when the opening command 18 of the urea flow regulating spray gun changes at a moment, the delay compensation calculation of the pure delay arithmetic unit 32 and the inertia arithmetic unit 33 is carried out to obtain the opening command compensation value of the urea flow regulating spray gun needing to be compensated.
9. The automatic control method for the thermal power generating unit urea method SCR denitration technology according to claim 1, wherein in the third step, the compensation value of the opening instruction of the urea flow regulation spray gun needing compensation in Smith predictive control obtained by the inertia arithmetic unit 33 and the opening instruction of the urea flow regulation spray gun of the PID cascade predictive control loop output by the second PID controller 30 are calculated by the second subtraction arithmetic unit 31 to obtain the real-time opening instruction 18 of the urea flow regulation spray gun, and compared with the control loop without the Smith predictive algorithm, the system can be adjusted back in advance to avoid disturbance caused by large inertia.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210669400.6A CN115025616B (en) | 2022-06-14 | 2022-06-14 | Automatic control method for SCR denitration technology of thermal power generating unit by urea method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210669400.6A CN115025616B (en) | 2022-06-14 | 2022-06-14 | Automatic control method for SCR denitration technology of thermal power generating unit by urea method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115025616A true CN115025616A (en) | 2022-09-09 |
| CN115025616B CN115025616B (en) | 2023-09-15 |
Family
ID=83125557
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210669400.6A Active CN115025616B (en) | 2022-06-14 | 2022-06-14 | Automatic control method for SCR denitration technology of thermal power generating unit by urea method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115025616B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115591378A (en) * | 2022-12-12 | 2023-01-13 | 清华大学（Cn） | Feedforward compensation and disturbance suppression control system and method for SCR denitration of thermal power generating unit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62248003A (en) * | 1986-04-22 | 1987-10-29 | Ishikawajima Harima Heavy Ind Co Ltd | Control device for ammonia injection quantity to denitrating device |
| CN105404145A (en) * | 2015-10-22 | 2016-03-16 | 西安西热控制技术有限公司 | Denitration novel cascade control method based on index prediction and time-lag pre-estimation compensation |
| CN105797576A (en) * | 2016-04-15 | 2016-07-27 | 中国大唐集团科学技术研究院有限公司西北分公司 | Coal-fired unit denitration ammonia spraying control method |
| CN114326387A (en) * | 2021-12-07 | 2022-04-12 | 江苏方天电力技术有限公司 | Denitration control device and method for thermal power generating unit |
-
2022
- 2022-06-14 CN CN202210669400.6A patent/CN115025616B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62248003A (en) * | 1986-04-22 | 1987-10-29 | Ishikawajima Harima Heavy Ind Co Ltd | Control device for ammonia injection quantity to denitrating device |
| CN105404145A (en) * | 2015-10-22 | 2016-03-16 | 西安西热控制技术有限公司 | Denitration novel cascade control method based on index prediction and time-lag pre-estimation compensation |
| CN105797576A (en) * | 2016-04-15 | 2016-07-27 | 中国大唐集团科学技术研究院有限公司西北分公司 | Coal-fired unit denitration ammonia spraying control method |
| CN114326387A (en) * | 2021-12-07 | 2022-04-12 | 江苏方天电力技术有限公司 | Denitration control device and method for thermal power generating unit |
Non-Patent Citations (1)
| Title |
|---|
| 王钧为等: "基于惯性滞后补偿的脱硝***先进控制方法研究", 《工业控制计算机》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115591378A (en) * | 2022-12-12 | 2023-01-13 | 清华大学（Cn） | Feedforward compensation and disturbance suppression control system and method for SCR denitration of thermal power generating unit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115025616B (en) | 2023-09-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105797576B (en) | Denitration ammonia injection control method for coal-fired unit | |
| CN105116855B (en) | A kind of optimal control method of flue gas circulating fluidized bed desulfurization | |
| CN105700570B (en) | SCR denitration control method for thermal power plant | |
| CN107420874B (en) | Ultra-supercritical thermal generator set coordination control system | |
| CN108837699A (en) | It is a kind of that ammonia optimization method and system are intelligently sprayed based on the SCR denitration of hard measurement and PREDICTIVE CONTROL | |
| CN106861407B (en) | It is a kind of for avoiding the blower of paired running from tacking the control method of phenomenon | |
| CN110538560A (en) | System and method for circularly combining desulfurization and ozone preoxidation denitration by using sintering flue gas | |
| CN115025616A (en) | Automatic control method for urea method SCR denitration technology of thermal power generating unit | |
| CN112650052A (en) | Thermal power generating unit SCR denitration control method for preventing failure of main regulation | |
| CN112452128A (en) | Control method for automatically adjusting nitrogen oxide set value at outlet of variable denitration SCR (Selective catalytic reduction) | |
| CN208097812U (en) | A kind of equipment for denitrifying flue gas | |
| CN111408243B (en) | Wet desulfurization pH value control system and method for thermal power generating unit | |
| CN109833773A (en) | A kind of NO_x Reduction by Effective ammonia flow accuracy control method | |
| CN110935303B (en) | Wet ammonia absorption method for removing SO (SO) applied to comprehensive energy2And NOxIs coupled control method of (a) | |
| CN112965386A (en) | Coal water slurry gasification and coal-fired boiler ultra-low NOx emission integrated cooperative control method | |
| CN108126517B (en) | A kind of hydrolysis of power plant is for ammonia denitrating system and its control method | |
| CN114838351B (en) | Automatic control method for desulfurization in circulating fluidized bed boiler | |
| CN104020797A (en) | Automatic control method for pH of ship exhaust gas desulphurization washing liquid | |
| CN114053865A (en) | Generalized predictive control method suitable for SCR denitration control system of coal-fired boiler | |
| CN111425884B (en) | Method for reducing emission concentration of sulfur dioxide in flue gas of full-combustion gas boiler | |
| CN109240380B (en) | Control method of urea pyrolysis flue gas heat exchanger system | |
| CN111228979A (en) | Advanced automatic control method and control device for PSR (polymer dispersed particulate reactor) polymer denitration dosage | |
| CN112780368B (en) | Main steam temperature control system of steam turbine generator set and control method thereof | |
| CN218530409U (en) | Denitration NO for ammonia preparation by urea pyrolysis X Regulating system | |
| CN113813755B (en) | Denitration full-load operation control method for coal-fired unit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |